// 移动端适配
;
(function(win){
    var doc = win.document;
    var docEl = doc.documentElement;
    var tid;

    function refreshRem(){
        var width  = docEl.getBoundingClientRect().width;
        if(width > 640){
            width = 640;
        }
        var rem = width/6.4;
        docEl.style.fontSize = rem + 'px';
    }
    
    win.addEventListener('resize',function(){
        clearTimeout(tid);
        tid = setTimeout(refreshRem,300);
    },false);

    win.addEventListener('pageshow',function(e){
        if(e.persisted){
            clearTimeout(tid);
            tid = setTimeout(refreshRem,300);
        }
    },false);

    refreshRem();
})(window);